Mold



-Ju l 30, 1929. J .,DIMEO 1,722,951

MOLD

Filed Sept. 11, 1926 '5 sheetsesheet 2 INVENTOR ATTORNEY J. J. DIMEO MOLD July 30, 1929.

Filed Sept. 11, 1926 5 Sheets-Sheet 3 INVENTOR J: J 6

L n w. 0 ,W n A M Q h- J. J. DIMEO July 30, 1929.

MOLD

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MOLD

FiledSept. 11, 1926 5 Sheets-Sheet E INVENTOR 1.]. J. Di/nvao. BY m ATTORN EY Patented July 30, 1929.

UNITED STATES PATENT OFFICE.

JAMES J'. DIMEO, OF CLEVELAND, OHIO, ASSIGNOR TO THE PERMOLD COMPANY, OF

CLEVELAND, OHIO, A CORPORATION OF OHIO. I

MOLD.

Application filed September 11, 1926. Serial No. 134,896.

This invention relates to molds for forming hollow castings, such as of a pan-like shape, and more particularly to a sectional mold provided with movably mounted core members adapted to be freed from a casting after it has been formed in the mold the mold being designed particularly for forming castings of aluminum or aluminum alloys, or other metals having a high crystallization shrinkage and relatively low freezing point.

An object of the present invention is to form the interior of a hollow casting by means of a core composed of interfitting sections which fit together in such a manner that they may be removed after the casting is formed through a single opening in the castlng.

A further object is to so form the portions of the core members around which the casting is formed that they will fit together and conform to the interior of a casting having an opening and an interior cavity of greater size than the opening, and to mount the core members in the mold for movement, one at an angle with respect to another to permit removal of laterally extending portions of the core through the opening.

With the above and other objects in view, the invention may be said to comprise the mold as illustrated in the accompanying drawings hereinafter described and particularly set forth in the appended claims, to-

- gether with such variations and modifications thereof as will be apparent to one skilled in the art to which the invention appertains.

Reference should be had to the accompanying drawings forming a part of this specification in which: 7

Figure 1 is a side elevation of a mold embodying the invention, showing the sections in position for pouring.

Fig. 2 is a top plan view of the mold with the sections in position for pouring.

Fig. 3 is an end elevation of the mold.

Fig. L is a central vertical transverse section through the mold showing the inner side of one of the sections in elevation.

Fig. 5 is a section taken on the line indicated at 55 in Fig. 3 showing the sections in closed position with a casting in the mold.

Fig. 6 is a section similar to that shown in Fig. 5 with the sections separated and the core members moved to positions clear of the casting.

Fig. 7 is a plan view of a casting formed in the mold.

Fig. 8 is a transverse section through the casting taken on the line indicated at 88 in Fig. 7.

Fig. 9 is a side elevation of the casting.

Referring to the accompanying drawings, the mold is supported upon a suitable base member or supporting frame 1 and has a section 2 fixed to one end of the frame and a section 3 mounted for movement on the frame toward and from the fixed section. The section 3 is slidable upon the top of the frame 1 and is guided by rods 4 fixed at one end to the section 2, passing through bearing portions 5 and fixed at the other end to a stand ard 6 secured to the opposite end of the frame. The section 3 of the mold has a rack bar T fixed thereto and extending rearwardly through an opening in the standard 6, and this rack bar is engaged by a pinion 8 fixed to a transverse shaft 9 journaled in bearing members 10 projecting forwardly from the standard 6. The shaft 9 extends to the front side of the frame and has fixed thereto a handle 11 by means of which the shaft may be turned to shift the mold section 3 toward or from the fixed section 2.

lVhile the principle of the present inven tion may be employed in forming hollow castings of various shapes in which core sec tions are mounted for removal through an opening smaller than the cavity of the casting, the mold herein shown is designed to form a fan casing for suction sweepers such as illustrated in Figs. 7, 8 and 9 of the drawing which shows the casting as it comes from the mold with the surplus metal still connected thereto. The casting has a body portion 12 circular in form and having a closed side 13, and a cylindrical flange 14 extending out from the side 13. The body portion 12 forms a fan housing, and integral with the body portion there is a hollow lateral extension 15 which forms the air outlet from the housing and which terminates in an angularly disposed hollow end portion 16. A sprue 17 is connected by a narrow neck portion 18 to one edge of the extension 15, anda riser 19 is connected by a nar row neck portion 20 to the edge of the flange 14L Centrally thereof the side 13 which forms the top of the fan housing has a boss 21 provided with a central opening 22 to receive the fan shaft, and the extension 15 has an (itl opening 23 provided with a surrounding boss 24:. The extension has also laterally extending trunnions 25 provding means for supporting the casing on the sweeper carriage.

The inner faces of the mold sections 2 and 3 have flat marginal face portions 26 which engage with each other when the sections are brought together, and in the faces of the sections there are provided coinpleinental recesses forming a sprue cavity 17, a riser cavity 19, and the casting cavity in which the casting is formed. Restricted gates 17 and 19' are shown intermediate the casting cav ity proper and the sprue cavity 17, and riser avity 19, respectively. The mold sections 2 and 3 have angularly disposed extensions 27 and 23 adjacent the tops thereof which are recessed to form between them the angular-1y disposed handle receiving portion 16 of the casting, and the extension 28 has a. slidable core pin 29 thereon adapted to be moved into the cavity between the extensions to form the core for the hollow angularly disposed end portion of the extension. The movable core section 3 h as a circular recess 30 conforming to the exterior of the closed side 13 and 14 of the casting, and a con'imunicating recess 31 extending laterally therefrom which conforms to one side of the extension 15 of the casting. The fixed section 2 has a con tral opening 32 which registers with the cirular recess 30 of the section 3 and is of r diameter equal to the internal diameter or the cylindrical flange of the casting. Extending laterally from the opening 32, the inner face of the section 2 has recesses complemenal to the recess 31 in the section 3, and the two sections have complemental recesses forming the sprue cavity 17 and the riser cavity 19 so that the entire casting is formed in a cavity between the recessed faces of the mold sections, the cavity so formed conforming to the cxta-zrier of the casting.

The interior of the casting is formed by means of a sectional core which is positioned within the casting cav ty and conforms to the interior of the casting. The core is formed by two members 33 and 34 slid-ably mou in the fixed section 2, the member 33 being mounted for cndwise movement in the opening 32, and the member 3 being mounted for movement in a direction at right angles to the axis of the opening The core member 33 fits within the opening and has a forward end portion conforming to the major portion of the interior of the body portion of the casting, the core member 33 having a rahbeted portion 35 in which an inner end portion 36 of the core member 3a is adapted to lit. The inner end portion 36 of the core member 3 f fits in the rabbeted portion 35 of the core member 33 when the core member 33 is in operative position, the two core members filling the cylindrical opening adjacent the mold cavity. At the forward end of the portion 36 the core member 34 has an outwardly extending core arm 3"? which tapers outwardly and conforms to the interior of the lateral extension of the casting. The rear end of the portion 36 has an outwardlyextending arm 33 slidably mounted in the mold section 2.

In assembling the mold for pouring, the sections 2 and 3 are brought together, the core section is moved outwardly to bring the inner end portion 36 thereof in o on gagement with the wall of the opening 32, and to position the core arm 37 in the extension forming portion of the castin cavity, and the core section 33 is then mover inwardly to bring the rabbeted portion 35 into engagement with the inner portion 36 of the core member 34:, thereby forming a solid sectional core in position to form the interior of the casting.

After pouring, the casting is allowed to cool and. harden, the core pin 29 is retracted, freeing the mold section 3 from the casting so that it can be moved rearwardly. The casting is then freed from the section 2 by retracting the core member 33 until its forward end is clear of the core member 3a and then moving the core member 3% inwardly until the core arm 3'? lies wholly within the circular portion of the casting so that it can pass through the open side of the casting and the casting can be removed.

The sprue cavity 17 and the riser cavity 19 are preferably in the top portion of the mold, and to permit them to be so located the extensions 27 and 28 extend upwardly and outwardly one side of the mold to leave suflicient space at the top for the sprue and the riser cavities. The core member 3a is carried by the extension 27 and moves lengthwise thereof to enter the core arm 36 into the portion of the casting cavity between the arm 27 and 23.

The central boss 21 and opening of the casting are formed by a recess 21 in the end of the core member 33and a projection 22 in the bottom of the recess 30 of the movable mold section 3 which engages the bottom of the recess 21 The opening 23 and surrounding boss are formed by a projection 23 in the bottom of he portion 31 of the recess in he face of the mold. section 3, which engages with the core arm 37 and'a recess 2 F surrounding the projection. The trunnions 25 are formed betwen a recessed projection on the section 3 which cooperates with a suitable recess in the section 2. ldeans is preferably provided for applying force manuv to he mm e e core member to shift them to and from operative positions. To this end the core pin 29 has rack teeth 39 which are engaged by a pinion ll) fixed to a shaft 41 which has a handle 2 at its outer end by which it may be turned to shift the core pin 29 inwardly or outwardly. The core member 33 has a rack bar 43 fixed thereto which is engaged by a pinion 44 fixed to a transverse shaft 45 which is provided with a handle 46 by which it may be turned to shift the core member to and from operative position, and the arm 38 of the core member 34 has rack teeth 47 engaged by a pinion 48 fixed to a shaft 49 which is provided with a handle 50, by which it may be turned to shift the core member 33 inwardly or outwardly.

It will be obvious that by varying the form of the recesses in the mold sections, and by correspondingly varying the shape of the members forming the sectional core castings wide variations in shape may be made in molds embodying the principle of the present invention, and it is to be understood that the structure illustrated and specifically described herein is but one of the various mechanical forms in which the principle of the invention may be employed.

What I claim is:

1. A mold for forming hollow castings consisting of a pair of separable sections adapted to be secured together and having complemental recesses forming a gate and a cavity conforming to the exterior of the casting, one of said sections having an opening leading to said cavity, a core member having an arm slidably mounted in the latter section and extending transversely of the opening, a parallel arm adapted to project into the cavity between said sections and a connecting portion in the opening integral with said arms, and a second core member slidably mounted in said opening and engaging the first core member to hold the same in its outermost position.

2. A mold for forming hollow castings consisting of a pair of separable sections adapted to be secured together and l aving complemental recesses forming a gate and a cavity conforming to the exterior of the casting, one of said sections having an opening leading to said cavity, a core member having an arm slid-ably mounted in the latter section and extending transversely of the opening, a parallel arm adapted to project into the cavity between said sections and a connecting portion in the opening integral with said arms, and means for actuating said core member.

3. A mold for forming hollow castings consisting of a pair of separable sections adapted to be secured together and having complemental recesses forming a gate and a cavity conforming to the exterior of the casting, one of said sections having an opening leading to said cavity, a core member having arm slidably mounted in the latter section and extending transversely of the opening, parallel arm adapted to pro ject into the cavity between said sections and a connecting portion in the opening integral with said arms, and a slidable core member carried, by the other mold section, the latter core member being disposed at an angle to the first mentioned core member and adapted to engage with the outer end of the arm thereof within said cavity.

4. In a permanent mold, in combination, a plurality of mold sections arranged to define the exterior of a casting cavity, a pair of permanent core members arranged to define the hollow interior of the casting including a re-entrant portion, one of said core members being arranged to form a portion of the cast-ing interior and being movable outwardly away from the casting cavity, the other core member being arranged to form said re-entrant portion and being movable inwardly toward the center of said casting cavity after the removal outwardly of said first core member, and means carried by the mold for moving said core members.

5. In a permanent mold for the formation of a casting having a re-entrant hollow portion, in combination, a plurality of permanent mold sections arranged to cooperate to define the exterior surface of said casting, a permanent core member arranged to define a portion of the interior of said casting, a second permanent core member car ied by one of said mold sections arranged to define a re-entrant hollow portion of said casting, means carried by said mold sect-ion for moving said second core member, said second core member being movable inwardly toward the center of the hollow casting after the removal of said first core member, whereby said mold sections may be subsequently separated for the removal of the finished casting.

6. In a permanent mold for forming a casting having a re-entrant hollow portion, in combination, a plurality of mold sections aranged to define the exterior surface of the asting, a permanent core member carried by one of said mold sections and arranged to de finea portion of the interior of said hollow casting, a second permanent core member carried by said mold section arranged to co operate with said first core member and to define a re-e-ntrant portion of the hollow interior of said casting, said first core member being removable outwardly from the hollow interior of the casting, means for withdrawing ,said first core member, said second core member being movable inwardly toward the center of said hollow casting after removal of said first core member, and means carried by said mold section for moving said second core member inwardly, whereby said mold sections may be subsequently separated for the removal of said casting.

In testimony whereof I ailix my signature.

JAMES J. DIMEO. 

